Boiler coal gas combustion system and control method

Abstract

The application relates to the technical field of boiler control, and discloses a boiler coal gas combustion system and a control method. The system comprises a boiler, a plurality of blast furnace gas burners, the plurality of blast furnace gas burners being uniformly arranged on the circumferential side of the boiler and extending into the hearth inside the boiler, a plurality of coke oven gas burners, the plurality of coke oven gas burners being uniformly arranged on the circumferential side of the boiler and extending into the hearth inside the boiler, wherein the coke oven gas burners are located below the blast furnace gas burners in opposition, and an air combustion air duct for providing air for the blast furnace gas burners and the coke oven gas burners. The technical scheme disclosed by the application can improve the safety of ignition of the boiler coal gas combustion system and the fullness of coal gas combustion, and can improve the safety of operating personnel and main equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler control, and discloses a boiler gas combustion system and a control method. BACKGROUND

[0002] At present, the combustion sufficiency of a boiler is greatly different according to the type characteristics of a gas burner, the on-site process requirements, the equipment safety, the configuration of an ignition gun and other factors. The boiler cannot quickly realize gas cutting when an abnormality occurs, and cannot ensure the safety of the main equipment of the boiler and the operating personnel. In the ignition process of the boiler, the safety needs to be improved. Therefore, it is particularly important to realize reliable and safe ignition while realizing sufficient combustion of the boiler.

[0003] However, the prior art cannot ensure the safe ignition of the boiler gas combustion system and the sufficient combustion of the gas, and cannot improve the safety of the operating personnel and the main equipment. SUMMARY

[0004] The present application relates to the technical field of boiler control, and discloses a boiler gas combustion system and a control method. The safety of ignition of the boiler gas combustion system and the sufficiency of gas combustion can be improved, and the safety of the operating personnel and the main equipment can also be improved.

[0005] Other characteristics and advantages of the present application will become apparent from the following detailed description, or will be learned by practice of the present application.

[0006] According to one aspect of an embodiment of the present application, a boiler gas combustion system is provided, which comprises: a boiler; a plurality of blast furnace gas burners, which are uniformly arranged on the periphery of the boiler and extend into the interior of a hearth of the boiler; a plurality of coke oven gas burners, which are uniformly arranged on the periphery of the boiler and extend into the interior of the hearth of the boiler, wherein the coke oven gas burners are located below the blast furnace gas burners; and an air duct for providing air for the blast furnace gas burners and the coke oven gas burners.

[0007] In one embodiment of the present application, based on the foregoing scheme, the system further comprises a blast furnace gas pipeline and a coke oven gas pipeline; the blast furnace gas pipeline is connected with the blast furnace gas burners through a first mounting flange and is used for providing blast furnace gas for the blast furnace gas burners; and the coke oven gas pipeline is connected with the coke oven gas burners through a second mounting flange and is used for providing coke oven gas for the coke oven gas burners.

[0008] In an embodiment of the present application, based on the foregoing scheme, the blast furnace gas pipeline is provided with a first pneumatic quick cut valve for opening or closing the blast furnace gas pipeline and a first electric regulating valve for regulating the flow of blast furnace gas in the blast furnace gas pipeline; the coke oven gas pipeline is provided with a second pneumatic quick cut valve for opening or closing the coke oven gas pipeline and a second electric regulating valve for regulating the flow of coke oven gas in the coke oven gas pipeline.

[0009] In an embodiment of the present application, based on the foregoing scheme, the blast furnace gas pipeline is provided with a first pressure transmitter and a first low pressure protection switch for monitoring and controlling the pressure in the blast furnace gas pipeline; the coke oven gas pipeline is provided with a second pressure transmitter and a second low pressure protection switch for monitoring and controlling the pressure in the coke oven gas pipeline.

[0010] In an embodiment of the present application, based on the foregoing scheme, the system further comprises an ignition gun, an ignition instruction end, a power control box, and an ignition power source, wherein the ignition gun is installed on the upper side of the coke oven gas burner inside the furnace, the ignition instruction end is used to remotely turn on and turn off the ignition power source by controlling the power control box, and the ignition power source is connected with the ignition gun after being converted into high-voltage direct current power by the power control box to realize ignition.

[0011] In an embodiment of the present application, based on the foregoing scheme, the system further comprises a blast furnace gas flame detector and a coke oven gas flame detector; the blast furnace gas flame detector is installed on the upper side of the blast furnace gas burner for monitoring the flame signal of the blast furnace gas burner; the coke oven gas flame detector is installed on the upper side of the coke oven gas burner for monitoring the flame signal of the coke oven gas burner.

[0012] In an embodiment of the present application, based on the foregoing scheme, the system further comprises a first fire detection cooling pipeline and a second fire detection cooling pipeline; the first fire detection cooling pipeline is used to input fire detection cooling air into the protective sleeve of the blast furnace gas flame detector to reduce the operating environment temperature of the blast furnace gas flame detector; the second fire detection cooling pipeline is used to input fire detection cooling air into the protective sleeve of the coke oven gas flame detector to reduce the operating environment temperature of the coke oven gas flame detector.

[0013] In an embodiment of the present application, based on the foregoing scheme, the furnace of the boiler is provided with a third pressure transmitter, a third low pressure protection switch, and a third high pressure protection switch for monitoring and controlling the pressure inside the furnace of the boiler.

[0014] In one embodiment of the present application, based on the foregoing scheme, the blast furnace gas burner and the coke oven gas burner are both composed of multiple rows of pipe bundles, and an electric baffle door is installed in the combustion air channel for controlling the on-off of the combustion air; wherein the combustion air contacts the pipe bundles of the blast furnace gas burner through the combustion air channel, so that the blast furnace gas is fully integrated at the outlet of the blast furnace gas burner pipe bundle, so as to achieve full and safe combustion and utilization of the blast furnace gas; the combustion air contacts the pipe bundles of the coke oven gas burner through the combustion air channel, so that the coke oven gas is fully integrated at the outlet of the coke oven gas burner pipe bundle, so as to achieve full and safe combustion and utilization of the coke oven gas.

[0015] According to one aspect of the embodiment of the present application, a control method of a boiler gas combustion system is also provided, the method is applied to the boiler gas combustion system as described above, and the method comprises:

[0016] S1, the control system determines whether the ignition condition is met according to the ignition condition logic, and if the ignition condition is met, step S2 is executed;

[0017] S2, the operator triggers an ignition instruction through the ignition instruction end;

[0018] S3, the operator inserts the ignition gun into the furnace of the boiler;

[0019] S4, the ignition gun is controlled to connect to the ignition power source based on the ignition instruction;

[0020] S5, the second pneumatic quick switch valve in the coke oven gas pipeline is controlled to open;

[0021] S6, the second electric regulating valve in the coke oven gas pipeline is controlled to open;

[0022] S7, the coke oven gas flame detector is used to monitor whether there is a flame signal of the coke oven gas burner, and if there is, step S8 is executed, and if not, step S4 is returned;

[0023] S8, the ignition power source is disconnected, and the ignition gun is withdrawn from the furnace of the boiler;

[0024] S9, the ignition of each coke oven gas burner is sequentially performed according to S1 to S8;

[0025] S10, when it is monitored that there is a flame signal of each coke oven gas burner and the ignition gun is withdrawn, step S11 is executed;

[0026] S11, the first pneumatic quick switch valve in the blast furnace gas pipeline is controlled to open;

[0027] S12, the first electric regulating valve in the blast furnace gas pipeline is controlled to open;

[0028] S13, Ignition of blast furnace gas burner based on flame generated by coke oven gas burner;

[0029] S14. Monitor whether there is a flame signal in the blast furnace gas burner using a blast furnace gas flame detector. If there is, proceed to step S17; otherwise, proceed to step S15.

[0030] S15, control the first pneumatic quick-cut valve in the blast furnace gas pipeline to close;

[0031] S16, After identifying and resolving the fault, return to step S11;

[0032] S17, ignite each blast furnace gas burner in sequence;

[0033] S18: If flame signals are detected in all blast furnace gas burners, it is determined that the boiler gas burners have been successfully ignited, and the burner ignition control process ends.

[0034] In some embodiments of this application, by evenly arranging multiple blast furnace gas burners and multiple coke oven gas burners around the periphery of the boiler and extending into the furnace, while placing the coke oven gas burners below the blast furnace gas burners, the safety of the boiler gas combustion system ignition can be improved. Furthermore, by providing air to the blast furnace gas burners and the coke oven gas burners through combustion-supporting air ducts, the degree of gas combustion can be improved, thereby enhancing the overall safety of operators and the main equipment.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0037] Figure 1 This is a schematic diagram of a boiler gas combustion system from the top of the boiler, as shown in an embodiment of this application.

[0038] Figure 2 This is a schematic diagram of a boiler gas combustion system from the bottom of the boiler, as shown in an embodiment of this application.

[0039] Figure 3A partial detail configuration view of a boiler gas combustion system according to an embodiment of the present application;

[0040] Figure 4 A flow chart of a control method of a boiler gas combustion system according to an embodiment of the present application;

[0041] The reference signs are explained as follows:

[0042] 111 - first pressure transmitter, 211 - second pressure transmitter,

[0043] 112 - first low pressure protection switch, 212 - second low pressure protection switch,

[0044] 113 - blast furnace gas flame detector, 213 - coke oven gas flame detector,

[0045] 114 - blast furnace gas pipeline, 214 - coke oven gas pipeline,

[0046] 115 - first electric regulating valve, 215 - second electric regulating valve,

[0047] 116 - first pneumatic quick cut-off valve, 216 - second pneumatic quick cut-off valve,

[0048] 117 - blast furnace gas burner, 217 - coke oven gas burner,

[0049] 311 - combustion air duct, 218 - ignition power supply,

[0050] 312 - electric baffle door, 219 - ignition command terminal,

[0051] 411 - boiler, 220 - power supply control box,

[0052] 412 - third pressure transmitter, 221 - ignition gun,

[0053] 413 - third low pressure protection switch, 414 - third high pressure protection switch. DETAILED DESCRIPTION

[0054] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these examples are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art. Like reference numerals may refer to like elements throughout.

[0055] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.

[0056] The schematic diagrams shown in the drawings are only illustrative, and the devices, systems or components not shown in the schematic diagrams do not mean that they do not exist, but can not be observed or omitted under the perspective.

[0057] The flowcharts shown in the drawings are only illustrative, and do not necessarily include all contents and operations / steps, nor do they necessarily execute in the order described. For example, some operations / steps can be further divided, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to the actual situation.

[0058] It should be noted that "multiple" referred to herein means two or more. The association relationship of "and / or" described associated objects means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally means that the associated objects before and after are in an "or" relationship.

[0059] It should be noted that the terms "first", "second", and the like in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the objects thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described.

[0060] The implementation details of the technical solutions of the embodiments of the application are described in detail as follows:

[0061] Referring to Figure 1 , Figure 2 , and Figure 3 , a boiler coal gas combustion system is provided.

[0062] Specifically, in the present application, the system comprises: a boiler 411; a plurality of blast furnace gas burners 117, which are uniformly arranged on the periphery of the boiler 411 and extend into the interior of the hearth of the boiler 411; a plurality of coke oven gas burners 217, which are uniformly arranged on the periphery of the boiler 411 and extend into the interior of the hearth of the boiler 411, wherein the coke oven gas burners 217 are located opposite the blast furnace gas burners 117; and an air duct 311 for providing air for the blast furnace gas burners 117 and the coke oven gas burners 217.

[0063] In one embodiment of the present application, the boiler 411 can be a cuboid columnar boiler, and the blast furnace gas burners 117 and the coke oven gas burners 217 can be four in number, which can be symmetrically arranged in the blast furnace gas layer and the coke oven gas layer in the hearth according to the four corners of the boiler body, for example, as shown in Figure 1 and Figure 2 .

[0064] In the present application, the plurality of blast furnace gas burners 117 and the plurality of coke oven gas burners 217 are uniformly arranged on the periphery of the boiler 411 and extend into the interior of the hearth of the boiler 411, which can make the blast furnace gas and the coke oven gas uniformly distributed in the interior of the hearth of the boiler, thereby ensuring that each radiation heating surface in the hearth is uniformly heated and improving the efficiency and safety of ignition. Meanwhile, the air duct 311 provides air for the blast furnace gas burners 117 and the coke oven gas burners 217, which can improve the degree of fullness of the combustion of the blast furnace gas and the coke oven gas in the interior of the hearth of the boiler.

[0065] Continuing to refer to Figure 3 , in one embodiment of the present application, the system can further comprise a blast furnace gas pipeline 114 and a coke oven gas pipeline 214; the blast furnace gas pipeline 114 is connected to the blast furnace gas burners 117 through a first mounting flange (not shown in the figure) and is used to provide blast furnace gas for the blast furnace gas burners 117; and the coke oven gas pipeline 214 is connected to the coke oven gas burners 217 through a second mounting flange (not shown in the figure) and is used to provide coke oven gas for the coke oven gas burners 217.

[0066] In the present application, the blast furnace gas pipeline 114 and the coke oven gas pipeline 214 are used to provide blast furnace gas and coke oven gas for the blast furnace gas burners 117 and the coke oven gas burners 217, respectively, which can ensure the stability and continuity of the operation of the blast furnace gas burners 117 and the coke oven gas burners 217 in the interior of the hearth of the boiler.

[0067] Continuing to refer to Figure 3In an embodiment of the present application, the blast furnace gas pipeline 114 can further be provided with a first pneumatic quick cut valve 116 for opening or closing the blast furnace gas pipeline 114 and a first electric regulating valve 115 for regulating the flow of blast furnace gas in the blast furnace gas pipeline 114; the coke oven gas pipeline 214 can further be provided with a second pneumatic quick cut valve 216 for opening or closing the coke oven gas pipeline 214 and a second electric regulating valve 215 for regulating the flow of coke oven gas in the coke oven gas pipeline 214.

[0068] In the present application, by installing electric regulating valves and pneumatic quick cut valves in the blast furnace gas pipeline 114 and the coke oven gas pipeline 214, precise regulation and remote reliable shutdown of the gas flow can be realized by the centralized control system, which can ensure the safe operation of the boiler furnace and the on-site equipment while realizing sufficient safe combustion and utilization of the gas.

[0069] Continuing to refer to Figure 3 In an embodiment of the present application, the blast furnace gas pipeline 114 can further be provided with a first pressure transmitter 111 and a first pressure low protection switch 112 for monitoring and controlling the pressure in the blast furnace gas pipeline 114; the coke oven gas pipeline 214 can further be provided with a second pressure transmitter 211 and a second pressure low protection switch 212 for monitoring and controlling the pressure in the coke oven gas pipeline 214.

[0070] In the present application, the pressure transmitters and pressure low protection switches installed in the blast furnace gas pipeline 114 and the coke oven gas pipeline 214 can realize real-time detection and monitoring of the gas pressure in the gas pipeline and low-pressure interlock protection (i.e., when the gas pressure in the pipeline is too low, the gas cannot be normally delivered to the inside of the blast furnace, affecting the normal combustion of the burner in the furnace, and thus real-time detection and monitoring of the gas pressure in the gas pipeline and low-pressure interlock protection are required), and by installing pressure instruments on the gas medium, real-time monitoring and protection of the pressure can be realized, especially the gas medium through the pressure low protection switch and the pressure transmitter can create conditions for realizing hard-soft common interlock protection of the pressure protection value, ensuring the safe and stable operation of the main equipment of the boiler.

[0071] Continuing to refer to Figure 3In an embodiment of the present application, the system can further comprise an ignition gun 221, an ignition instruction end 219, a power control box 220, and an ignition power supply 218, wherein the ignition gun 221 is installed on the upper side of the coke oven gas burner 217 inside the furnace, the ignition instruction end 219 is used to remotely turn on and turn off the ignition power supply 218 by controlling the power control box 220, and the ignition power supply 218 is connected to the ignition gun 221 after being converted into high-voltage direct-current power by the power control box 220 to realize ignition.

[0072] In the present application, the ignition gun 221 is installed on the upper side of the coke oven gas burner 217 inside the furnace, the ignition power supply 218 is connected to the ignition gun 221 after being converted into high-voltage direct-current power by the power control box 220, the high-energy ignition effect of the ignition gun 221 is realized, the coke oven gas burner 217 can be successfully ignited at one time, and the ignition instruction end 219 can remotely turn on and turn off the ignition power supply 218 by the power control box 220.

[0073] Continuing to refer to Figure 3 In an embodiment of the present application, the system can further comprise a blast furnace gas flame detector 113 and a coke oven gas flame detector 213, wherein the blast furnace gas flame detector 113 is installed on the upper side of the blast furnace gas burner 117 to monitor the flame signal of the blast furnace gas burner 117, and the coke oven gas flame detector 213 is installed on the upper side of the coke oven gas burner 217 to monitor the flame signal of the coke oven gas burner 217.

[0074] In the present application, the arrangement of the boiler burner can realize the ignition control process that the ignition gun 221 ignites the coke oven gas layer and then the blast furnace gas layer is ignited by the coke oven gas layer, the design and installation of the flame detector can further ensure the success of ignition, interlocking protection can be realized, and reliable gas combustion and safe furnace environment can be ensured.

[0075] Continuing to refer to Figure 3 In an embodiment of the present application, the system can further comprise a first fire detection cooling pipeline (not shown in the figure) and a second fire detection cooling pipeline (not shown in the figure), wherein the first fire detection cooling pipeline is used to input fire detection cooling air into the protective sleeve of the blast furnace gas flame detector 113 to reduce the operating environment temperature of the blast furnace gas flame detector 113, and the second fire detection cooling pipeline is used to input fire detection cooling air into the protective sleeve of the coke oven gas flame detector 213 to reduce the operating environment temperature of the coke oven gas flame detector 213.

[0076] In the present application, the fire detection cooling air can be input into the protection sleeve of the flame detector through the fire detection cooling pipeline, and enter the furnace with the flame detector, so as to effectively reduce the temperature of the flame detector equipment operating environment, provide guarantee for long-term performance stability and reliability of the equipment, and ensure the safe operation of the entire boiler combustion system.

[0077] With reference to the foregoing Figure 3 In an embodiment of the present application, the furnace of the boiler 411 is provided with a third pressure transmitter 412, a third low pressure protection switch 413 and a third high pressure protection switch 414 for monitoring and controlling the pressure inside the furnace of the boiler 411.

[0078] In the present application, by installing the third pressure transmitter 412, the third low pressure protection switch 413 and the third high pressure protection switch 414 in the furnace of the boiler, real-time remote monitoring of the pressure in the furnace of the boiler can be realized, and conditions for interlocking protection of the boiler burner can be created, ensuring the safe and stable operation of the main equipment of the boiler (i.e. when the gas pressure in the furnace of the boiler is too high, the gas cannot be normally delivered to the inside of the furnace, affecting the normal combustion of the burner in the furnace, and thus real-time detection and monitoring of the gas pressure in the furnace of the boiler are required).

[0079] With reference to the foregoing Figure 3 In an embodiment of the present application, the blast furnace gas burner 117 and the coke oven gas burner 217 are each composed of multiple rows of pipe bundles, and the combustion air passage 311 is provided with an electric baffle door 312 for controlling the on-off of the combustion air; wherein the combustion air contacts the pipe bundles of the blast furnace gas burner 117 through the combustion air passage 311, so that the blast furnace gas is fully mixed with the blast furnace gas at the outlet of the pipe bundles of the blast furnace gas burner 117, to realize full and safe combustion and utilization of the blast furnace gas; the combustion air contacts the pipe bundles of the coke oven gas burner 217 through the combustion air passage 311, so that the coke oven gas is fully mixed with the coke oven gas at the outlet of the pipe bundles of the coke oven gas burner 217, to realize full and safe combustion and utilization of the coke oven gas.

[0080] In the present application, the blast furnace gas burner 117 and the coke oven gas burner 217 are composed of multiple rows of pipe bundles and extend into the inside of the furnace of the boiler, and the burner pipe bundles are installed in the combustion air passage 311, so that the combustion air can be fully mixed with the gas at the outlet of the pipe bundles, to realize full and safe combustion and utilization of the gas, and provide guarantee for improving the thermal efficiency of the boiler and achieving standard emission of flue gas. The electric baffle door 312 is installed on the combustion air passage 311, and can realize on-off control of the combustion air.

[0081] With reference to the foregoing Figure 4According to an aspect of the embodiment of the present application, a control method of a boiler gas combustion system is also provided. The method is applied to the boiler gas combustion system as described above, and the method comprises:

[0082] S1, the control system determines whether the ignition condition is met according to the ignition condition logic, and if the ignition condition is met, step S2 is executed;

[0083] S2, the operator triggers the ignition instruction through the ignition instruction end;

[0084] S3, the operator inserts the ignition gun into the furnace of the boiler;

[0085] S4, the ignition gun is controlled to connect to the ignition power source based on the ignition instruction;

[0086] S5, the second pneumatic quick cut valve in the coke oven gas pipeline is controlled to open;

[0087] S6, the second electric regulating valve in the coke oven gas pipeline is controlled to open;

[0088] S7, the coke oven gas flame detector is used to monitor whether there is a flame signal of the coke oven gas burner, and if there is, step S8 is executed, and if not, step S4 is executed;

[0089] S8, the ignition power source is disconnected, and the ignition gun is withdrawn from the furnace of the boiler;

[0090] S9, according to S1 to S8, each coke oven gas burner is ignited in turn;

[0091] S10, when it is monitored that each coke oven gas burner has a flame signal and the ignition gun is withdrawn, step S11 is executed;

[0092] S11, the first pneumatic quick cut valve in the blast furnace gas pipeline is controlled to open;

[0093] S12, the first electric regulating valve in the blast furnace gas pipeline is controlled to open;

[0094] S13, the blast furnace gas burner is ignited based on the flame generated by the coke oven gas burner;

[0095] S14, the blast furnace gas flame detector is used to monitor whether there is a flame signal of the blast furnace gas burner, and if there is, step S17 is executed, and if not, step S15 is executed;

[0096] S15, the first pneumatic quick cut valve in the blast furnace gas pipeline is controlled to close;

[0097] S16, after the fault cause is found out and solved, step S11 is executed.

[0098] S17, igniting each blast furnace gas burner in turn;

[0099] S18, when it is monitored that each blast furnace gas burner has flame signal, it is determined that the blast furnace gas burner is ignited successfully, and the burner ignition control process is ended.

[0100] In the present application, first, the control system determines whether the ignition condition is met according to the ignition condition logic, after the ignition condition is met, the operator issues an ignition instruction, the ignition lance is inserted into the furnace interior of the boiler, the operator issues an instruction to control the ignition lance to turn on the power to ignite, the second pneumatic quick switch valve is opened, the second electric regulating valve is slowly opened, the coke oven gas flame detector is used to detect whether the burner has flame signal, after the flame signal is detected, the ignition lance power is turned off and the ignition lance is withdrawn from the furnace, the other coke oven gas burners in the coke oven gas layer are started in turn, after the control system confirms that all the burners in the coke oven gas layer have flame signal and the ignition lance is withdrawn to the position, the blast furnace gas burner has ignition condition, first, the first pneumatic quick switch valve is opened, then the first electric regulating valve is slowly opened, the corresponding blast furnace gas burner is ignited by using the corresponding coke oven gas flame in the same direction, whether the burner has flame signal is detected by the blast furnace gas flame detector, if there is no flame signal, the pneumatic quick switch valve in the gas pipeline connected with the burner is closed, then the reason is found out and the problem is handled, the ignition control process for the burner is executed again, after it is confirmed that the burner is ignited successfully, the other blast furnace gas burners in the blast furnace gas layer are started in turn, after it is confirmed by the blast furnace gas flame detector that all the blast furnace gas burners have flame signal, it is determined that the gas burner is ignited successfully, and the burner ignition control process is ended.

[0101] In an embodiment of the present application, the ignition condition in the step S1 can include the following eight conditions.

[0102] Condition 1, all the flame detectors do not detect flame detection signal;

[0103] Condition 2, the boiler furnace pressure is within -0.1kPa to -0.15kPa;

[0104] Condition 3, the pressure in all the fire detection cooling pipelines is higher than 7kPa;

[0105] Condition 4, the combustion air volume in the combustion air duct is within the process requirement range;

[0106] Condition 5, the blast furnace gas pressure in the blast furnace gas pipeline is higher than 4kPa;

[0107] Condition 6, the coke oven gas pressure in the coke oven gas pipeline is higher than 2kPa;

[0108] Condition 7, the first pneumatic quick cut valve in the blast furnace gas pipeline is in a closed state;

[0109] Condition 8, the second pneumatic quick cut valve in the coke oven gas pipeline is in a closed state.

[0110] In the present application, after the above-mentioned eight ignition conditions are met, the coke oven gas burner can execute an ignition control process.

[0111] Further, after the burner ignition is normally put into use, if any one of the following five situations occurs, the boiler gas combustion system triggers an interlock protection mechanism.

[0112] Situation 1, there is no flame detection signal detected by the flame detector;

[0113] Situation 2, the boiler furnace pressure is higher than a set threshold value;

[0114] Situation 3, the boiler furnace pressure is lower than a set threshold value;

[0115] Situation 4, there is a pressure in the fire detection cooling pipeline lower than a set threshold value;

[0116] Situation 5, there is a low gas pressure signal in the gas pipeline and the gas pressure value is lower than a protection value.

[0117] In the present application, if any one of the above-mentioned five situations is met, the boiler gas combustion system triggers an interlock protection mechanism, that is, the control system will remotely control the first pneumatic quick cut valve and the second pneumatic quick cut valve to be closed, so that the blast furnace gas and the coke oven gas cannot enter the boiler furnace, effectively ensuring the safety of the boiler main equipment and the operating personnel.

[0118] In one or more technical solutions provided in the embodiments of the present application, at least the following technical effects or advantages are achieved:

[0119] The boiler gas combustion system and the control method thereof provided in the embodiments of the present application realize reliable and safe ignition and commissioning of the boiler gas burner system, and the design of the burner system structure is conducive to full combustion of gas and energy utilization, which is of great significance to reducing coal consumption, improving power generation efficiency and environmental protection benefits, and also has important significance to energy saving and emission reduction of steel plants and effective and sufficient utilization of energy.

[0120] The design of the interlock protection of the gas burner system ensures that once the abnormality of the on-site production working condition parameters occurs, the timely interlock protection action of the pneumatic quick cut valve device can be realized through the control system, effectively ensuring the safety of the boiler main equipment and the operating personnel.

[0121] The arrangement of the boiler burner can realize the ignition control process of igniting the coke oven gas layer by the ignition gun and igniting the blast furnace gas layer by the coke oven gas layer, and further ensures the ignition success by the design and installation of the flame detector, and realizes the interlock protection to ensure the reliable combustion of the gas and the safety of the furnace environment.

[0122] The tube bundle structure of the boiler burner provides the condition for the sufficient fusion and combustion of the gas and the combustion air, and is important for improving the thermal efficiency of the boiler.

[0123] The gas medium pipeline of the gas burner adopts the valve group structure combining the electric regulating valve and the pneumatic quick cut valve, which can realize the regulation of the gas flow according to the gas supply situation of the steel plant, control the reliable on-off of the gas medium, and provide the condition for realizing the interlock protection.

[0124] The fire detection cooling air can effectively reduce the temperature of the operation environment of the flame detector equipment, and provides the guarantee for the long-term performance stability and reliability and the equipment operation safety, and is important for the operation safety of the whole boiler combustion system.

[0125] The pressure instruments are installed at the key positions of the gas medium and the furnace to realize the real-time monitoring and protection of the pressure, and especially the gas medium and the furnace pressure can create the condition for realizing the hard-soft interlock protection of the pressure protection value through the pressure protection switch and the pressure transmitter, and ensure the operation safety and stability of the boiler main equipment.

[0126] In addition, the above-described drawings are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not for the purpose of limitation. It is easily understood that the processes shown in the above-described drawings do not indicate or limit the time sequence of the processes. In addition, it is also easily understood that the processes can be executed synchronously or asynchronously, for example, in multiple modules.

[0127] It should be understood that the present application is not limited to the precise construction which has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application should only be limited by the appended claims.

Claims

1. A boiler gas combustion system, characterized in that, The system includes: boiler; Multiple blast furnace gas burners are evenly arranged around the periphery of the boiler and extend into the furnace of the boiler. Multiple coke oven gas burners are evenly arranged around the periphery of the boiler and extend into the furnace of the boiler, wherein the coke oven gas burners are located opposite to the blast furnace gas burners. A combustion-supporting air duct, which is used to supply air to the blast furnace gas burner and the coke oven gas burner; The system also includes an ignition gun, an ignition command terminal, a power control box, and an ignition power supply. The ignition gun is installed on the upper side of the coke oven gas burner inside the furnace. The ignition command terminal is used to remotely connect and disconnect the ignition power supply by controlling the power control box. The ignition power supply is converted into high-voltage DC power by the power control box and then connected to the ignition gun so that the ignition gun ignites the coke oven gas layer, and then the coke oven gas layer ignites the blast furnace gas layer, thereby achieving ignition. Both the blast furnace gas burner and the coke oven gas burner consist of multiple rows of tube bundles. An electric damper is installed in the combustion air duct to control the flow of combustion air. The combustion air contacts the tube bundles of the blast furnace gas burner through the combustion air duct, ensuring full fusion with the blast furnace gas at the tube bundle outlet for safe and efficient combustion. Similarly, the combustion air contacts the tube bundles of the coke oven gas burner through the combustion air duct, ensuring full fusion with the coke oven gas at the tube bundle outlet for safe and efficient combustion.

2. The system according to claim 1, characterized in that, The system also includes a blast furnace gas pipeline and a coke oven gas pipeline; the blast furnace gas pipeline is connected to the blast furnace gas burner via a first mounting flange for supplying blast furnace gas to the blast furnace gas burner; the coke oven gas pipeline is connected to the coke oven gas burner via a second mounting flange for supplying coke oven gas to the coke oven gas burner.

3. The system according to claim 2, characterized in that, The blast furnace gas pipeline is equipped with a first pneumatic quick-cut valve and a first electric regulating valve. The first pneumatic quick-cut valve is used to open or close the blast furnace gas pipeline, and the first electric regulating valve is used to regulate the flow rate of blast furnace gas in the blast furnace gas pipeline. The coke oven gas pipeline is equipped with a second pneumatic quick-cut valve and a second electric regulating valve. The second pneumatic quick-cut valve is used to open or close the coke oven gas pipeline, and the second electric regulating valve is used to regulate the flow rate of coke oven gas in the coke oven gas pipeline.

4. The system according to claim 3, characterized in that, The blast furnace gas pipeline is equipped with a first pressure transmitter and a first low-pressure protection switch for monitoring and controlling the pressure inside the blast furnace gas pipeline; the coke oven gas pipeline is equipped with a second pressure transmitter and a second low-pressure protection switch for monitoring and controlling the pressure inside the coke oven gas pipeline.

5. The system according to claim 4, characterized in that, The system also includes a blast furnace gas flame detector and a coke oven gas flame detector; the blast furnace gas flame detector is installed on the upper side of the blast furnace gas burner and is used to monitor the flame signal of the blast furnace gas burner; the coke oven gas flame detector is installed on the upper side of the coke oven gas burner and is used to monitor the flame signal of the coke oven gas burner.

6. The system according to claim 5, characterized in that, The system further includes a first flame detection cooling pipe and a second flame detection cooling pipe; the first flame detection cooling pipe is used to input flame detection cooling air into the protective sleeve of the blast furnace gas flame detector to reduce the operating ambient temperature of the blast furnace gas flame detector; the second flame detection cooling pipe is used to input flame detection cooling air into the protective sleeve of the coke oven gas flame detector to reduce the operating ambient temperature of the coke oven gas flame detector.

7. The system according to claim 6, characterized in that, The boiler furnace is equipped with a third pressure transmitter, a third low pressure protection switch, and a third high pressure protection switch for monitoring and controlling the pressure inside the boiler furnace.

8. A control method for a boiler gas combustion system, characterized in that, The method is applied to the boiler gas combustion system as described in claim 7, and the method includes: S1, The control system determines whether the ignition conditions are met based on the ignition condition logic. If the ignition conditions are met, then step S2 is executed. S2, the ignition command is triggered by the operator through the ignition command terminal; S3, the operator inserts the ignition gun into the furnace of the boiler; S4, based on the ignition command, control the ignition gun to connect the ignition power supply; S5, control the second pneumatic quick-cut valve in the coke oven gas pipeline to open; S6, control the second electric regulating valve in the coke oven gas pipeline to open; S7. Monitor whether there is a flame signal in the coke oven gas burner using a coke oven gas flame detector. If there is, proceed to step S8; otherwise, return to step S4. S8, disconnect the ignition power supply and remove the ignition gun from the boiler furnace; S9, following S1 to S8, ignite each coke oven gas burner in sequence; S10, when flame signals are detected in all coke oven gas burners and the ignition gun is withdrawn, execute step S11; S11, control the opening of the first pneumatic quick-cut valve in the blast furnace gas pipeline; S12, control the opening of the first electric regulating valve in the blast furnace gas pipeline; S13, Ignition of blast furnace gas burner based on flame generated by coke oven gas burner; S14. Monitor whether there is a flame signal in the blast furnace gas burner using a blast furnace gas flame detector. If there is, proceed to step S17; otherwise, proceed to step S15. S15, control the first pneumatic quick-cut valve in the blast furnace gas pipeline to close; S16, After identifying and resolving the fault, return to step S11; S17, ignite each blast furnace gas burner in sequence; S18: If flame signals are detected in all blast furnace gas burners, it is determined that the boiler gas burners have been successfully ignited, and the burner ignition control process ends.

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